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标题：Augmentation of Ca2+-Induced Microsomal Triglyceride Transfer Protein Activity by Glucose Supply Enhances Hypertriglyceridemia in Vivo
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作者：Hyun-Jeong Cho ; Hyo-Chan Kang ; Young-Cheol Ju 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2006
卷号：29
期号：5
页码：889-895
DOI：10.1248/bpb.29.889
出版社：The Pharmaceutical Society of Japan
摘要：We have investigated possible roles of intra-glucose supply on microsomal triglyceride (TG) transfer protein (MTP) in the secretion of TG-rich very low-density lipoprotein (VLDL) from the liver. Due to the activation of MTP, TG and apolipoprotein B (apoB) in the liver are assembled into VLDL and then the VLDL is transferred into the blood stream. High MTP activity can increase the release of VLDL into the blood stream, and this would lead high levels of TG and apoB in the blood. High MTP activity was found when the liver (or hepatocytes) contained a high level of total Ca²⁺ as a response of glucose administration. However, the MTP activity was reduced in response to the calmodulin antagonist N -(6-aminohexyl)-5-chloro-1-naphthalene sulfonamide (W-7, K _i=25 μ M ), the intracellular Ca²⁺ chelator BAPTA-AM, and the extracellular Ca²⁺ chelator EDTA. These suggested that there might be a very close relationship between high MTP activity and high Ca²⁺ level in the liver by glucose administration. Glucose-derived hyperglycemic condition resulted from those elevations of TG and total cholesterol in the liver. This hyperglycemic phenomenon may be associated with the increase of TG and apoB levels in blood. The possibility for the regulation of VLDL formation in the liver and, further, those related circulatory diseases due to the excess of VLDL in the blood stream by controlling MTP activity in association with Ca²⁺ was investigated.
关键词：glucose;microsomal triglyceride transfer protein;Ca2+;triglyceride;apolipoprotein B